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In mid-April, they should be returned to their original growing positions.  Tropical plants should be tossed before they freeze so they don’t pollute the water.  Some potted tropicals, like taro and papyrus, can successfully be over wintered as houseplants, kept in a shallow pan of water. 

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Place the plant in the container leaving the crown at the existing level and pack it tight.  Pea gravel on top of the soil will also help keep the soil from floating out.  Mineral potting soil is available and is a bit less messy.  Feed your marginals once a month with an aquatic plant food tablet for best results.  If a lot of fish are present in your pond, you might not have to feed your plants.  In the fall after a good hard freeze or two, hardy marginals should be sheared back to remove all brown foliage but left where they are.  Half-Hardy marginals should also be sheared back and be over wintered below the freeze line, usually 6-8” below the surface, to avoid freezing out their crowns.

Mays Greenhouse ©2010